Posted this on the Cannon community discord, but been recommended to share it here too.
So on surveying the site in HIP 14909 I located several clusters of the hull where upwards of 3 salvage drones were spraying/sucking material onto/off of the surface of the hull. The drones have also been noted to interact with the fungus like growths inside the unknown structures.
After the last Thargoid war it is known that we released a bio weapon on the Thargoids - a fungal like virus which corroded the Thargoid's bio ships. It is my belief that these are actually crashed/buried Thargoid capital ships. The reason they're abandoned/inactive and in such disrepair. I also believe that the Thargoid crew are either dead, or elsewhere in the ship (The Cartography room has several doors in the ceiling which could house more of the ship) they died out because they were now stranded because of the disease. The drones have been on auto pilot ever since, trying to cleanse the ships from the virus.
The map itself that we see after inputting the unknown objects (Ul/UP/UA) is either a data uplink, or their version of our Galnet map, it's their interface for controlling travel. This is the default view that we're seeing.
Here is an image I took from the site after I noticed 4 salvage drones gathered around this patch of hull.
We know from past interviews with David Braben that the cure to this plague never happened - there was no happy ending to the Thargoid war. These ships are relics from that war all that time ago, and this is why they're unoccupied and so heavily damaged.
The virus we used against them was fungal in origin, the postules that we find around the ship are corrosive, the drones appear to interact with them and take note - in between their other duties of repair and scanning. On the exterior, the drones congregate around the damaged portions of the hull where this fungal like material lines the hull of the ship.
Many of the locations, when viewed from orbit have a blast pattern, almost like they 'spun' into the surface like a screw. Similar to how we've observed the other Thargoid vessels move.
Some further thoughts - could the beam we see when the Ancient Relic is added to the interface be some kind of projected beam weapon? Could we have accidentally tripped the ship's weapons system or perhaps it's immune systems? Certainly the fact that all of the salvage drones become hostile when a relic is added to the interface suggests this in some fashion.
And there you have it Commanders, my theory on the situation we're slowly shedding light on. I hope it gives you pause for thought, and perhaps informs your future experiments and investigations.